I demand that Jason Boerner may or may not have written...
> I looked under .mozilla and found a folder for my profile named
> default/<wierd name>(I have no idea where this wierd name came from so
> if someone else does, I would find it historically interesting to know.)
>
> In this directory were two other folders, News and Mail.
> In each of these directories are subdirectories which contain your
> actual messages.
> I just updated my prefs.js to point to these folders and everything
> works.
>
Another thing that might have worked was to specify that .slt folder
when creating a new profile.